Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 | 2 | * |
4aa769b9 MH |
3 | * Bluetooth virtual HCI driver |
4 | * | |
9c724357 MH |
5 | * Copyright (C) 2000-2001 Qualcomm Incorporated |
6 | * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com> | |
7 | * Copyright (C) 2004-2006 Marcel Holtmann <marcel@holtmann.org> | |
4aa769b9 MH |
8 | * |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
1da177e4 | 24 | */ |
1da177e4 | 25 | |
1da177e4 LT |
26 | #include <linux/module.h> |
27 | ||
1da177e4 | 28 | #include <linux/kernel.h> |
4aa769b9 | 29 | #include <linux/init.h> |
1da177e4 | 30 | #include <linux/slab.h> |
4aa769b9 MH |
31 | #include <linux/types.h> |
32 | #include <linux/errno.h> | |
33 | #include <linux/sched.h> | |
1da177e4 | 34 | #include <linux/poll.h> |
1da177e4 LT |
35 | |
36 | #include <linux/skbuff.h> | |
37 | #include <linux/miscdevice.h> | |
38 | ||
1da177e4 LT |
39 | #include <net/bluetooth/bluetooth.h> |
40 | #include <net/bluetooth/hci_core.h> | |
1da177e4 | 41 | |
ac28494c | 42 | #define VERSION "1.3" |
4aa769b9 | 43 | |
36acbb1a AE |
44 | static bool amp; |
45 | ||
4aa769b9 MH |
46 | struct vhci_data { |
47 | struct hci_dev *hdev; | |
48 | ||
49 | unsigned long flags; | |
50 | ||
51 | wait_queue_head_t read_wait; | |
52 | struct sk_buff_head readq; | |
4aa769b9 MH |
53 | }; |
54 | ||
4aa769b9 | 55 | static int vhci_open_dev(struct hci_dev *hdev) |
1da177e4 LT |
56 | { |
57 | set_bit(HCI_RUNNING, &hdev->flags); | |
1da177e4 | 58 | |
1da177e4 LT |
59 | return 0; |
60 | } | |
61 | ||
4aa769b9 | 62 | static int vhci_close_dev(struct hci_dev *hdev) |
1da177e4 | 63 | { |
155961e8 | 64 | struct vhci_data *data = hci_get_drvdata(hdev); |
4aa769b9 | 65 | |
1da177e4 LT |
66 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) |
67 | return 0; | |
68 | ||
9c724357 | 69 | skb_queue_purge(&data->readq); |
4aa769b9 | 70 | |
1da177e4 LT |
71 | return 0; |
72 | } | |
73 | ||
4aa769b9 | 74 | static int vhci_flush(struct hci_dev *hdev) |
1da177e4 | 75 | { |
155961e8 | 76 | struct vhci_data *data = hci_get_drvdata(hdev); |
1da177e4 | 77 | |
9c724357 | 78 | skb_queue_purge(&data->readq); |
1da177e4 | 79 | |
4aa769b9 | 80 | return 0; |
1da177e4 LT |
81 | } |
82 | ||
4aa769b9 | 83 | static int vhci_send_frame(struct sk_buff *skb) |
1da177e4 LT |
84 | { |
85 | struct hci_dev* hdev = (struct hci_dev *) skb->dev; | |
9c724357 | 86 | struct vhci_data *data; |
1da177e4 LT |
87 | |
88 | if (!hdev) { | |
4aa769b9 | 89 | BT_ERR("Frame for unknown HCI device (hdev=NULL)"); |
1da177e4 LT |
90 | return -ENODEV; |
91 | } | |
92 | ||
93 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
94 | return -EBUSY; | |
95 | ||
155961e8 | 96 | data = hci_get_drvdata(hdev); |
1da177e4 | 97 | |
0d48d939 | 98 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
9c724357 | 99 | skb_queue_tail(&data->readq, skb); |
4aa769b9 | 100 | |
9c724357 | 101 | wake_up_interruptible(&data->read_wait); |
1da177e4 LT |
102 | |
103 | return 0; | |
104 | } | |
105 | ||
9c724357 | 106 | static inline ssize_t vhci_get_user(struct vhci_data *data, |
4aa769b9 | 107 | const char __user *buf, size_t count) |
1da177e4 LT |
108 | { |
109 | struct sk_buff *skb; | |
110 | ||
111 | if (count > HCI_MAX_FRAME_SIZE) | |
112 | return -EINVAL; | |
113 | ||
4aa769b9 MH |
114 | skb = bt_skb_alloc(count, GFP_KERNEL); |
115 | if (!skb) | |
1da177e4 | 116 | return -ENOMEM; |
4aa769b9 | 117 | |
1da177e4 LT |
118 | if (copy_from_user(skb_put(skb, count), buf, count)) { |
119 | kfree_skb(skb); | |
120 | return -EFAULT; | |
121 | } | |
122 | ||
9c724357 | 123 | skb->dev = (void *) data->hdev; |
0d48d939 | 124 | bt_cb(skb)->pkt_type = *((__u8 *) skb->data); |
1da177e4 LT |
125 | skb_pull(skb, 1); |
126 | ||
127 | hci_recv_frame(skb); | |
128 | ||
129 | return count; | |
1da177e4 LT |
130 | } |
131 | ||
9c724357 | 132 | static inline ssize_t vhci_put_user(struct vhci_data *data, |
4aa769b9 | 133 | struct sk_buff *skb, char __user *buf, int count) |
1da177e4 | 134 | { |
1da177e4 | 135 | char __user *ptr = buf; |
4aa769b9 MH |
136 | int len, total = 0; |
137 | ||
138 | len = min_t(unsigned int, skb->len, count); | |
1da177e4 | 139 | |
1da177e4 LT |
140 | if (copy_to_user(ptr, skb->data, len)) |
141 | return -EFAULT; | |
4aa769b9 | 142 | |
1da177e4 LT |
143 | total += len; |
144 | ||
9c724357 | 145 | data->hdev->stat.byte_tx += len; |
4aa769b9 | 146 | |
0d48d939 MH |
147 | switch (bt_cb(skb)->pkt_type) { |
148 | case HCI_COMMAND_PKT: | |
9c724357 | 149 | data->hdev->stat.cmd_tx++; |
0d48d939 | 150 | break; |
1da177e4 | 151 | |
0d48d939 | 152 | case HCI_ACLDATA_PKT: |
9c724357 | 153 | data->hdev->stat.acl_tx++; |
0d48d939 | 154 | break; |
1da177e4 | 155 | |
0d48d939 | 156 | case HCI_SCODATA_PKT: |
4f7ac181 | 157 | data->hdev->stat.sco_tx++; |
0d48d939 | 158 | break; |
2c24d454 | 159 | } |
1da177e4 LT |
160 | |
161 | return total; | |
162 | } | |
163 | ||
9c724357 MH |
164 | static ssize_t vhci_read(struct file *file, |
165 | char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 166 | { |
9c724357 | 167 | struct vhci_data *data = file->private_data; |
1da177e4 LT |
168 | struct sk_buff *skb; |
169 | ssize_t ret = 0; | |
170 | ||
1da177e4 | 171 | while (count) { |
9c724357 | 172 | skb = skb_dequeue(&data->readq); |
4db7589f MH |
173 | if (skb) { |
174 | ret = vhci_put_user(data, skb, buf, count); | |
175 | if (ret < 0) | |
176 | skb_queue_head(&data->readq, skb); | |
177 | else | |
178 | kfree_skb(skb); | |
179 | break; | |
1da177e4 LT |
180 | } |
181 | ||
4db7589f MH |
182 | if (file->f_flags & O_NONBLOCK) { |
183 | ret = -EAGAIN; | |
184 | break; | |
185 | } | |
1da177e4 | 186 | |
4db7589f MH |
187 | ret = wait_event_interruptible(data->read_wait, |
188 | !skb_queue_empty(&data->readq)); | |
189 | if (ret < 0) | |
190 | break; | |
1da177e4 | 191 | } |
1da177e4 LT |
192 | |
193 | return ret; | |
194 | } | |
195 | ||
4aa769b9 MH |
196 | static ssize_t vhci_write(struct file *file, |
197 | const char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 198 | { |
9c724357 | 199 | struct vhci_data *data = file->private_data; |
1da177e4 | 200 | |
9c724357 | 201 | return vhci_get_user(data, buf, count); |
1da177e4 LT |
202 | } |
203 | ||
4aa769b9 | 204 | static unsigned int vhci_poll(struct file *file, poll_table *wait) |
1da177e4 | 205 | { |
9c724357 | 206 | struct vhci_data *data = file->private_data; |
1da177e4 | 207 | |
9c724357 | 208 | poll_wait(file, &data->read_wait, wait); |
1da177e4 | 209 | |
9c724357 | 210 | if (!skb_queue_empty(&data->readq)) |
4aa769b9 MH |
211 | return POLLIN | POLLRDNORM; |
212 | ||
213 | return POLLOUT | POLLWRNORM; | |
214 | } | |
215 | ||
4aa769b9 | 216 | static int vhci_open(struct inode *inode, struct file *file) |
1da177e4 | 217 | { |
9c724357 | 218 | struct vhci_data *data; |
1da177e4 LT |
219 | struct hci_dev *hdev; |
220 | ||
9c724357 MH |
221 | data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); |
222 | if (!data) | |
1da177e4 LT |
223 | return -ENOMEM; |
224 | ||
9c724357 MH |
225 | skb_queue_head_init(&data->readq); |
226 | init_waitqueue_head(&data->read_wait); | |
1da177e4 | 227 | |
1da177e4 LT |
228 | hdev = hci_alloc_dev(); |
229 | if (!hdev) { | |
9c724357 | 230 | kfree(data); |
1da177e4 LT |
231 | return -ENOMEM; |
232 | } | |
233 | ||
9c724357 | 234 | data->hdev = hdev; |
1da177e4 | 235 | |
c13854ce | 236 | hdev->bus = HCI_VIRTUAL; |
155961e8 | 237 | hci_set_drvdata(hdev, data); |
1da177e4 | 238 | |
36acbb1a AE |
239 | if (amp) |
240 | hdev->dev_type = HCI_AMP; | |
241 | ||
4aa769b9 MH |
242 | hdev->open = vhci_open_dev; |
243 | hdev->close = vhci_close_dev; | |
244 | hdev->flush = vhci_flush; | |
245 | hdev->send = vhci_send_frame; | |
1da177e4 | 246 | |
1da177e4 | 247 | if (hci_register_dev(hdev) < 0) { |
4aa769b9 | 248 | BT_ERR("Can't register HCI device"); |
9c724357 | 249 | kfree(data); |
1da177e4 LT |
250 | hci_free_dev(hdev); |
251 | return -EBUSY; | |
252 | } | |
253 | ||
9c724357 | 254 | file->private_data = data; |
0dea0141 | 255 | nonseekable_open(inode, file); |
4aa769b9 | 256 | |
0dea0141 | 257 | return 0; |
1da177e4 LT |
258 | } |
259 | ||
4aa769b9 | 260 | static int vhci_release(struct inode *inode, struct file *file) |
1da177e4 | 261 | { |
9c724357 MH |
262 | struct vhci_data *data = file->private_data; |
263 | struct hci_dev *hdev = data->hdev; | |
1da177e4 | 264 | |
13ea4015 | 265 | hci_unregister_dev(hdev); |
1da177e4 LT |
266 | hci_free_dev(hdev); |
267 | ||
f75ae4d5 | 268 | skb_queue_purge(&data->readq); |
1da177e4 | 269 | file->private_data = NULL; |
bf18c711 | 270 | kfree(data); |
4aa769b9 MH |
271 | |
272 | return 0; | |
273 | } | |
274 | ||
2b8693c0 | 275 | static const struct file_operations vhci_fops = { |
fed4c250 | 276 | .owner = THIS_MODULE, |
4aa769b9 MH |
277 | .read = vhci_read, |
278 | .write = vhci_write, | |
279 | .poll = vhci_poll, | |
4aa769b9 MH |
280 | .open = vhci_open, |
281 | .release = vhci_release, | |
6038f373 | 282 | .llseek = no_llseek, |
1da177e4 LT |
283 | }; |
284 | ||
4aa769b9 | 285 | static struct miscdevice vhci_miscdev= { |
ac28494c MH |
286 | .name = "vhci", |
287 | .fops = &vhci_fops, | |
288 | .minor = MISC_DYNAMIC_MINOR, | |
1da177e4 LT |
289 | }; |
290 | ||
4aa769b9 | 291 | static int __init vhci_init(void) |
1da177e4 | 292 | { |
4aa769b9 | 293 | BT_INFO("Virtual HCI driver ver %s", VERSION); |
1da177e4 | 294 | |
329ab1b3 | 295 | return misc_register(&vhci_miscdev); |
1da177e4 LT |
296 | } |
297 | ||
4aa769b9 | 298 | static void __exit vhci_exit(void) |
1da177e4 | 299 | { |
329ab1b3 | 300 | misc_deregister(&vhci_miscdev); |
1da177e4 LT |
301 | } |
302 | ||
4aa769b9 MH |
303 | module_init(vhci_init); |
304 | module_exit(vhci_exit); | |
305 | ||
36acbb1a AE |
306 | module_param(amp, bool, 0644); |
307 | MODULE_PARM_DESC(amp, "Create AMP controller device"); | |
308 | ||
63fbd24e | 309 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
4aa769b9 MH |
310 | MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); |
311 | MODULE_VERSION(VERSION); | |
312 | MODULE_LICENSE("GPL"); |